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uBio  Web  Results 1 - 10 of about 3381 Broader Terms:    Animalia (animals)     Annelida/Echiura/Pogonophora     Eutrochozoa     Lophotrochozoa     Unnamed  More Specific:    Branchiobdellae     Clitellata (Clitellates)     Hirudinea (leeches)     Hirudinida     Oligochaeta (earthworms)     Pogonophora (beard worms)     Polychaeta (polychaetes)     Unassigned     Unassigned annelid     annelida worms     unclassified      Latest Articles on Annelida from uBioRSS Polychaeta Guiamarina External Resources: Did you mean: Anellidia or annélides? Common Names: Тип Кольчатые черви, annélides, Anelídeo, sanguessuga, annelids, segmented worms, Kolutićavci, Anelídeo, minhoca, annelid worms, annélides 1.  Integrative anatomical study of the branched annelid Ramisyllis multicaudata (Annelida, Syllidae). Ponz-Segrelles G, Glasby CJ, Helm C, Beckers P, Hammel JU, Ribeiro RP, Aguado MT Journal of morphology J Morphol Integrative anatomical study of the branched annelid Ramisyllis multicaudata (Annelida, Syllidae). 10.1002/jmor.21356 The sponge-dwelling Syllidae Ramisyllis multicaudata and Syllis ramosa are the only annelid species for which a branched body with one head and multiple posterior ends is known. In these species, the head is located deep within the sponge, and the branches extend through the canal system of their host. The morphology of these creatures has captivated annelid biologists since they were first discovered in the late XIXth century, and their external characteristics have been well documented. However, how their branched bodies fit within their symbiotic host sponges and how branches translate into internal anatomy has not been documented before. These features are crucially relevant for understanding the body of these animals, and therefore, the aim of this study was to investigate these aspects. In order to assess these questions, live observation, as wells as histology, immunohistochemistry, micro-computed tomography, and transmission electron microscopy techniques were used on specimens of R. multicaudata. By using these techniques, we show that the complex body of R. multicaudata specimens extends greatly through the canal system of their host sponges. We demonstrate that iterative external bifurcation of the body is accompanied by the bifurcation of the longitudinal organ systems that are characteristic of annelids. Additionally, we also highlight that the bifurcation process leaves an unmistakable fingerprint in the form of newly-described "muscle bridges." These structures theoretically allow one to distinguish original and derived branches at each bifurcation. Last, we characterize some of the internal anatomical features of the stolons (reproductive units) of R. multicaudata, particularly their nervous system. Here, we provide the first study of the internal anatomy of a branched annelid. This information is not only crucial to deepen our understanding of these animals and their biology, but it will also be key to inform future studies that try to explain how this morphology evolved. © 2021 Wiley Periodicals LLC. Ponz-Segrelles Guillermo G https://orcid.org/0000-0003-3591-9052 Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain. Glasby Christopher J CJ Natural Sciences Department, Museum and Art Gallery of the Northern Territory, Darwin, Northern Territory, Australia. Helm Conrad C Animal Evolution & Biodiversity, Georg-August-Universität Göttingen, Göttingen, Germany. Beckers Patrick P Institute of Evolutionary Biology and Ecology, University of Bonn, Bonn, Germany. Hammel Jörg U JU https://orcid.org/0000-0002-6744-6811 Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany. Ribeiro Rannyele P RP Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain. Aguado M Teresa MT Animal Evolution & Biodiversity, Georg-August-Universität Göttingen, Göttingen, Germany. eng Deutsches Elektronen-Synchrotron BES-2016-076419 Secretaría de Estado de Investigación, Desarrollo e Innovación CGL2015-63593-P Secretaría de Estado de Investigación, Desarrollo e Innovación Journal Article 2021 04 04 United States J Morphol 0406125 0022-2887 IM 3D reconstruction bifurcation morphology stolon | tree syllid worm 2021 03 26 2021 01 21 2021 03 30 2021 4 5 6 0 2021 4 5 6 0 2021 4 4 21 6 aheadofprint 33813762 10.1002/jmor.21356 J Morphol Screwed up: Spirality of segments and other iterated structures suggest an underlying principle of seriality in bilaterians. 10.1002/jmor.21350 This review deals with helicomery, that is, the specific malformation of a spiral arrangement of segments and other serial structures. Helicomery was first described in annelid and arthropod body segments. However, corresponding patterns occur in arthropod appendages and other bilaterians with serially arranged body parts, such as tapeworms, nematodes, vertebrates, and probably chitons. The specifics of the spirals such as length, orientation, and handedness are described. Most spirals are dorsal and comprise only a few loops. Helicomery is formed by a shift of cells during development or in adults caused by changes in cell adhesion or mechanical impacts such as lesions. A model for the formation of helicomery is proposed, which is based on medieval church labyrinths. These complex spiral structures are derived from concentric lines by the shift of relatively few tiles. This principle of "small causes, great effect" also applies to "spiral segments," because helicomery dissolves segmental patterns and questions the concept of segments as distinct structures. The widespread occurrence of helicomery in nonhomologous serial structures might indirectly indicate an underlying principle of seriality among Bilateria. © 2021 The Author. Journal of Morphology published by Wiley Periodicals LLC. Scholtz Gerhard G https://orcid.org/0000-0002-0112-4537 Humboldt-Universität zu Berlin, Institut für Biologie/Vergleichende Zoologie, Berlin, Germany. eng Journal Article Review 2021 03 22 United States J Morphol 0406125 0022-2887 IM Annelida Arthropoda Cestoda helicomery limbs 2021 03 17 2021 02 03 2021 03 19 2021 3 23 6 0 2021 3 23 6 0 2021 3 22 12 53 aheadofprint 33749870 10.1002/jmor.21350